armando christian perez, better known as pitbull is rehearsing his emcee duties in los angeles. tomorrow night's show will include performances by jennifer lopez, justin timberlake, katy perry, rihanna and miley cyrus. pitbull amping up for his new venture at host. >> never had a hosting gig or job but i wake up and host a world every day. what better place than with a room full of beautiful, sexy, sophisticated, power women. >> all righty then. tomorrow will mark the network prime time's debut of pitbull's latest hit "timber." catch it on abc 7 starting at 8:00 p.m. >>> a bay area high school has been honored for an innovative program that tackles head injuries in its athletes. student trainers are roaming the side lines of games to keep an eye on players, those with symptoms of a concussion are treated and may be pulled out of school for a week to recover. atlanta o'brien has suffered several concussions on the soccer field. the student trainers are critical for preventing serious head injuries. >> the players, they don't want to come out of the game. they want to be in there